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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c94f2506e07435a39a61f9b0535d9e04f498350c53177661a8823e0b6429001' 
  AND token = 'Lo6ApakHB/sq21YGWweoRdbRtgmxDCQozsuL1pe4Wq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}