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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08973965e2fac5282eba82c52bb4b66ae250077aae5de81f250a73f26532da9' 
  AND token = '6My312Uaqc48w3zFckdDToEcyGDLgtGgxkAeA96L6t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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