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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ded22195073d94202ac30a0969064c9af5e729318ec8d4a09851bb679940a2b' 
  AND token = 'g8Xz8bZBrQiSUnTGwiYUA1rv0Q/EQTl1CG/zrt4a9pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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