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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41de73210af248c6f18a031ef652ecf4e92bafe611ff6e16a9e5e0e24eb70b1' 
  AND token = 'ssqP5Id++QHolGzMC4M+WBfbdx0vxoCcDSmdQ8EKxfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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