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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56eed9158b7f89b77b4f892d00e9019dcc8a6ce39764f3e9724c337151974fcf' 
  AND token = 'Nyrhe00CbeG3oc/aeNw80jRXi7/fpYpjpv/U3rv5goI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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