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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ca6b9271a35c00a407ae09442601d65ef1deb657ec607cb0724157f3b82277' 
  AND token = '3beYtQNUI1+rVx6N/bgW4IuhLufpaIiBR4gADMhfIlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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