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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0e579b526d580c6c95c75bf6ba957e459b38c2b14dd3fc452334ccc4d4c86e' 
  AND token = '7mB29CK4zzE5X8RDlE4x5++Nk5Xm6eX6C+UhAhvx2WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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