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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c1e3d4f2830e877f5e4032bb76b4f627933782546eb2caef8f31c3b4201619' 
  AND token = 'PB6DWT7Aq6kmk/RvSHEMWzcaQ4geMPyYMOwxGqLBWNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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