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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8f9835fdea05277854924eee344dd4d2e904a00c115ef9384a0e143e61a277' 
  AND token = 'ceOARNOnLgD7KeR5juIif2oE3trGvM/6fqSKyb6BZAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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