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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f01d7f4a1ae7eba0929d612ead3b170f5b9de167dfde7f005e3730fc8741c90' 
  AND token = '0YSDmP3toRbtt/OlpCV1tcRLzuhLozQGqbiM6i6UsWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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