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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7600a581e4594839555d36bb12b7d1c2abce914357ba291aba36d0d0bae91c11' 
  AND token = 'kGs8aJY+9cf2D3GtlWw4otkfPgcQ0Ml4X+Pf79PInng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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