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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55970d7e74f3803eff18fa28aedee5c9633f3e874203fffdbaf4d08dc40a1b2a' 
  AND token = 'BnT7Af67EJKpyZ3fLtEjzJrtEbJFp/b1gg8cYb5JMg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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