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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf4e5594cf069290de75dcc39f3425a586bfe591bc6eee7f83daf04043efb84' 
  AND token = '7Sm/IZFbekTYhX++iD44H2HYaHxd32gACwcd5Kd18F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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