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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9150b7c2ca5cc685e8f2d73086941167fb7d9dba0a5c383815023c3341f704' 
  AND token = '/aYPE24l5z6Lakkh2cdorOyjeSEC6o3UvXR3/AljFXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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