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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7739d3667e271cac35ccd502b532125e26bad7b705f7331647594e9bb39fdc50' 
  AND token = 'yUjNeuxRO4cBqFzR4IGkrcJ/c/tD0FA4LmXafml9cGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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