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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd6af69423c68c345c88a8f02a6530af6357a9d4c2f8971fea5dabd6ef9c1a7' 
  AND token = 'fdDL5RvBcAVHKQxl0pFkAUDWc4Ue8kMNJrutX1zpR2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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