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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa70876f91dc427ed9eb4f6abb20acc4faff83668b608861f16b936d3a254250' 
  AND token = 'G63q+4syx68KrfyV0cRo9hfy/trsmeK3CW95r5jS74k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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