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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a87d5bbfb2c6c925aa9d316e401daef9fe89c22542079ac5c51d7a1936d77fc' 
  AND token = 'rLtqHx2YVnidHm1xJB9GEy7r9VuUqJavBEYt3RA8nKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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