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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac860a74564f9c005332454971081b125f96c0ec4b447b6979dc7a73b4870d2e' 
  AND token = 'KEMnqNj9SU/a7bakmAoE/ifJ7fvb37HXUQ04Bn8yzB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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