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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952aadade0dfb5e44878bd4d19631e10a0d64e75362e8edd051ade215e7f656f' 
  AND token = 'UZWZgGHCfVHZ830GlL2GKXbGxl0novb0kaiwvFIlcKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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