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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7943df5adf4971745d85fc9d1931192f522f9d4e196700380a0dae26ee13e439' 
  AND token = 'xowLghL6kHIbs7T0WkCSIPFBD9BxYFPAq13gv46rsiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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