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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b06e802c7f6af2b5c530ee5e640f2e8824655d262d892a3478e260441d523d' 
  AND token = 'uMRXi2jH9qGzTYs5TzDocvtKxcFGV6K5F2HU6HrsGHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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