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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfb04edbc72d98b214db1dbbebc727ff77640f31b28a3443b84cece157cbc2e' 
  AND token = 'caLHAo+phmUkn88J5vy1gGedtVULq+V5iLHOrRB5YiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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