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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b43de8647aae41f146a78ade40eb21a74dcdc80055898bc7948190da0991daa' 
  AND token = 'NQjpSkNQ5el2lwdGwkU2fuBEJ31ZTg+17X1fHFdja64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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