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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158a85eca2ef4cff46c276d067bc2491fc1867e5ddfc2bf1981c13799a182754' 
  AND token = 'IJhVC1PkNJX0y/FkTsfknMVhQdLWiZLxM3vDNW+I/N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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