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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef30ab2c01aa093627f2cb37e7fbae660037385875f38592763b0b772b9a660' 
  AND token = '4DWU+ZaWJ2ade704nFxwRG9B/D5Wc6aFCvrxgt3hQ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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