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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07f33e172021c08528edf4eb0b0f41f4bbafbd3f2537ced1a88782ef6090017' 
  AND token = 't9uYO62GFfvswAKqbl3Xak3/vBGBC/EQsITr0z2Drjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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