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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40845b92d9a0ad5a31c12d5679950c015ad69efa412192de82ea6a827b488615' 
  AND token = 'bBWvAbxOY6srnRB3mDOcwXdoMUWRIzJmdAOhdMkZ59Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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