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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c47d4efcf59ff3deba0be58280b16620865c90d6768bd2c26c9f2ae27d89e3c' 
  AND token = 'IfzRXkd4vjEmz6U/c0pc2mjPhys7oxo+Cw7wguHrEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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