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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df0e07e37328bfc8a3b57e7ae9e1fab137e073febfb51f2a631fdde20dda06a' 
  AND token = '/P3dreSM6x1FXOxOWu04l01e2lqYq9ncsoypi9oL4lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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