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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2399cb098bb50fe086385ec9df7d73697d6725ed32a967d3d259bafe925aa4' 
  AND token = 'BHeAB5R/QQWB4tGS0Ra0uk3rXC2oZNJtYhu3aljCepE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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