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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfb2723df238563414ecf43cb4f649f47d92cd05a6e90b98ac488459a6e6806' 
  AND token = '86XiSjpjZIekA/pfdHNBqco5asyIC5qMLi6i+gsrsBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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