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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00f7d13d2b95e4b08398c750555e9a5f373666a19e9e66e330e9f21a97f001d' 
  AND token = 'PcSARZl1gRIJ49QvIdTn+hRWo/rEpkLOAIYrTj8XdFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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