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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca3618927ee9ac032e629d69e10eb0450b89bdea17db207ffcc610b50a26e7b' 
  AND token = 'G3kVJF67xE2826E9mrP2Fum93TCMpRRpm9rw+/JHzE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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