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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17646e98cab5ac27c7f23ab42305426821a786558d598e5abb173b7a0b09b69b' 
  AND token = 'aNLBIewZyfr5tMiVgn7fo5QpNZMIDeCCG3r05SMFTOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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