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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab08594ae5d26e19c0ddb6346424a02ae3e324b5a86cd3701c5b2901ee8cdb7' 
  AND token = 'sq89OGRaTZxMLTQpL65AFEq4ovi+U33mqvSD5t5U4lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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