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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a88204b786cc8f121a4ec829dbf45d32cb3a666f1aad41725f8818a3704431' 
  AND token = 'MXCLNK69wIxts14QVCg0jJlPfaFN0gDBRj6NARHEy2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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