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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868c324fbb73ea39dc985e30b935cc75a9a80ca66d4a1a93c6bc026751974e9e' 
  AND token = 'dQQs1xYmdvhM9hAyCaSJBaBuAAYXrJ0BLMJ1ZPt90Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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