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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72a6b3de63700897ee237224c201e87aba5b84bb33e9e77e6c82d256aebd4a9' 
  AND token = '0DcrnvZBXTo4F+rkcysvz3ajL+QfoxVxCR+eEm+2UsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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