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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006a0762c60ed4ed4231246b15713f1f35d9591132b6732e12034b3db2042adf' 
  AND token = '7x/r0rreFqgzWiR4KkQGmMf154urUoe3Qk+vyXJZUaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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