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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0607953d42a39158fe4f448e2a742d1177184ceadc368ac1117a694f6f4739a' 
  AND token = 'FpVgLm58mhOHu75BaPvRKc3C7Wctd6En4Fx4AQQrHmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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