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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a03176aa0f9f3e7a04547ab0e9cab913084cd401a8a9f1f655cd4c050995da' 
  AND token = 'Ys8KBRKW1ZhLxE4wB4edcSUw4TW6jg9NqL4YZSMrtnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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