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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3315e1ca200303fc4f79d9421aabac145d34fea0629085599899e81ba42699e2' 
  AND token = 'HeA03zdtP+F77ujt3/r0flrU715mDgPAoiAujpd/+rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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