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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6765e87880d6fcc987cf66e7c246f57126e7e1ab42cdf7fb214353a2079273' 
  AND token = 'a3P+qJW6+qq7QCC4OMrVEVND12vzBSqZv+x6LUF2TIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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