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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff9f9d060179b6ab766fee5f1dcd00e31c4e6324538c1f23c3f42765a25700a' 
  AND token = 'mUzwLMnw5U2pxO8aMursunKHxTDha4pdt2/lC+BTHWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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