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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba3b31dc2c3f2557214dd33364ddcdf3192c1de75db9141a33ae5bc8e257c5d' 
  AND token = 'FKTyp4A59/p2QChKC9eEbJhcwChqrGvKEAORfrCVNk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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