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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d18093b994bc17260a3a0b8425750b5fc1b1c5bf9f390482d992906d4b77dd6' 
  AND token = 'aW8/5JQmnUkdYNJ6lPbkM82HrphgP383cwYshDPAJK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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