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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c9f5af5e04976ae214cf3aa2d88ff33d95a45e95d4dac7fbfda514f71bf4e6' 
  AND token = 'MG8VltOtFXMbrF4XMPN6SnTXMITrqagOnfmit06hyjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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