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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4deb3f17fa15858748d454db67d06ec2f2f0b51df2403241c0c4856cf16c28e7' 
  AND token = '978/KN+ybtfKcxi9wI6nMHqr6rB8I1+GmNQ9OYGGqMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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