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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fde6704e0334fcc67d0f703402bec7a7c0adb1d6a855e0b0f0f5036949307e' 
  AND token = 'PIjZJAsJEW6G0/BUW5rrngRcw4oE72W1URrbX28kHCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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