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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e407dc11bc4f75c94af8329becef94b9f9fdd1dcb8a19f62192f7fb79cb0fd32' 
  AND token = 'pM7dNuDgfEB1cmeSuc9ty2nmKW+oUAckLVhiUXhhUsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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