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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a88d1046ad03e7827d5eeafb4fbf8684432867c5f68d4386145777a2952e9b' 
  AND token = 'Ii5cdHknKQk/sybxIFSiub3NcRLcqfiJmvhmz1IduJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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