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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900c64ed7e5bfad69712c6ea690ec5aac68d3893372a6b014c485c969eb7b1be' 
  AND token = 'h9OKWNgBLZqa4uomr+XvpcfPzy6xDYKqucl01C9pJk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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