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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea948ee6d9065650891a72ca8c57254f4d94f66a1df4ac460e30a42a9165708' 
  AND token = 'Qc21I3Rmo6YUIOZLnmPRekh1OiHShFO4WEokJ09kjGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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