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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097407ca480dab032a1856b3e3d633283752c3001b892f13533fd2a66cd4e8c1' 
  AND token = 'fw6kwoh6iicMtFyWbVyKEijQ8u3vtX6dlo3x7FqrpIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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